Malicious PDF — malware analysis report

Static analysis result for SHA-256 036d9721d9f95bdf…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 02:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 589376bea5833fdacec3315571fb4211 SHA-1: 2071da639cba0048573a591d5b46edd749431867 SHA-256: 036d9721d9f95bdf19158828d512b14863621c11d3917db27557678395412ed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a common tactic of using documents to host redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=makara+rasi+guru+peyarchi+2018+to+2019+in+tamil+pdf PDF link annotation
    • https://oilbasaro.com/web/images/ckfinder/files/20210615133506.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/4632898742.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/83712054560.pdfIn PDF document text
    • http://hydrem.ru/images/file/sekamalejalebujosuj.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/gefolozomikoduzovelako.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/26461042495.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f371b62020---65315750706.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe2e7914e---25628382323.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6ed1807f2d2d862f00c2d7e97a33f659/97516442927.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864652c140d---dakefedeba.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/sutezisivepepumif.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f294076f359---walanoz.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/witesewatelejifi.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/98240515958.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/4156536541.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e71d08290cfcbdd8c79a6f19d9b76f5a/lunikogutivan.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e095947b1d5---16252383822.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/mejarevo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cef9a8a03---pifibivodikulinaxub.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/21107641048.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a60ede3093a---kejufopitinoluturowijat.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/90083628989.pdfIn PDF document text
    • https://airbays.com/userfiles/file/18084253556.pdfIn PDF document text
    • http://artside.org/data/temp/file/74014695260.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/19415440307.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6E 22948 bytes
SHA-256: feff1609ac09d197e8a1c973a25d07d445f6cee91922b0f898019ed38c41c8b9
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 12036 bytes
SHA-256: c20ba1535705ed1f5ed863599c2a6be484ead3bb91079df8086fa1711e6027c5
font_02_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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